delta/cpython-git.git/Python/suggestions.c, branch enum-lost-fixes

bpo-44655: Don't include suggestions for attributes that are the same as the missing one (GH-27197) (GH-27198)

2021-07-16T21:16:08+00:00

(cherry picked from commit 6714dec5e104bdee4a0ed4d9966de27d1bfa1e3d)

Co-authored-by: Pablo Galindo Salgado

bpo-38530: Refactor and improve AttributeError suggestions (GH-25776)

2021-05-03T15:47:27+00:00

- Make case-swaps half the cost of any other edit
- Refactor Levenshtein code to not use memory allocator, and to bail early on no match.
- Add comments to Levenshtein distance code
- Add test cases for Levenshtein distance behind a debug macro
- Set threshold to `(name_size + item_size + 3) * MOVE_COST / 6`.
  - Reasoning: similar to `difflib.SequenceMatcher.ratio()` >= 2/3:
```
"Multiset Jaccard similarity" >= 2/3
matching letters / total letters >= 2/3
(name_size - distance + item_size - distance) / (name_size + item_size) >= 2/3
1 - (2*distance) / (name_size + item_size) >= 2/3
1/3 >= (2*distance) / (name_size + item_size)
(name_size + item_size) / 6 >= distance
With rounding:
(name_size + item_size + 3) // 6 >= distance
```

Co-authored-by: Pablo Galindo

bpo-38530: Require 50% similarity in NameError and AttributeError suggestions (GH-25584)

2021-04-27T00:22:27+00:00

bpo-38530: Cover more error paths in error suggestion functions (GH-25462)

2021-04-17T22:28:45+00:00

bpo-38530: Include builtins in NameError suggestions (GH-25460)

2021-04-17T21:26:54+00:00

bpo-38530: Match exactly AttributeError and NameError when offering suggestions (GH-25443)

2021-04-16T16:12:03+00:00

bpo-38530: Optimize the calculation of string sizes when offering suggestions (GH-25412)

2021-04-14T23:03:43+00:00

bpo-38530: Make sure that failing to generate suggestions on failure will not propagate exceptions (GH-25408)

2021-04-14T17:58:28+00:00

bpo-38530: Offer suggestions on NameError (GH-25397)

2021-04-14T14:10:33+00:00

When printing NameError raised by the interpreter, PyErr_Display
will offer suggestions of simmilar variable names in the function that the exception
was raised from:

    >>> schwarzschild_black_hole = None
    >>> schwarschild_black_hole
    Traceback (most recent call last):
      File "", line 1, in 
    NameError: name 'schwarschild_black_hole' is not defined. Did you mean: schwarzschild_black_hole?

bpo-38530: Offer suggestions on AttributeError (#16856)

2021-04-14T01:36:07+00:00

When printing AttributeError, PyErr_Display will offer suggestions of similar 
attribute names in the object that the exception was raised from:

>>> collections.namedtoplo
Traceback (most recent call last):
  File "", line 1, in 
AttributeError: module 'collections' has no attribute 'namedtoplo'. Did you mean: namedtuple?